The NES game in question is Mystery World Dizzy, which was discovered last year. Here's the Reddit link.

The Super NES game that I'm talking about is the Rayman SNES prototype (or test demo, I'm not sure) that was dumped on the Internet yesterday by Omar Cornut, one of the developers of the Wonder Boy: The Dragon's Trap HD game. Here is his Twitter post explaining about it.

As far as I know, these games haven't been dumped in the No-Intro DB yet.